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Author
- Geological Survey (U.S.)6
- Kanivetsky, Roman2
- Minnesota Geological Survey2
- Sims, P. K. (Paul Kibler), 1918-20112
- Cotter, R. D. (Ralph D.), 1929-1
- Hall, Charles M. (Charles Monroe), 1870-19031
- Henderson, John R.1
- McIntosh, Willard L.1
- Oakes, Edward L.1
- Ojakangas, Richard W.1
- Percival, J. A.1
- Sardeson, Frederick W. (Frederick William), 1866-19581
- United States. Bureau of Soils1
- Winchell, N. H. (Newton Horace), 1839-19141
